10. In a few years’ time, those mountains will be covered with trees, too.
几年之后，那些山上也将栽满了树。
in a few years’ time意思是“几年时间之后”，类似的用法还有：In two days’ time, in three months’ time等。例如：
In two days’ time, the work will be finished.
两天的时间，就能完成此项工作。
11. Was it difficult to work on the Great Green Wall?
从事绿色长城工作难吗？
It + is / was + 形容词 + 不定式。这种句型中不定式是真正的主语，it是形式主语。例如：
It’s best to plant trees in spring.
最好在春季植树。
It’s best to read English every day.
最好每天读英语。
It’s interesting to play games with Children.
和孩子们一起做游戏是很有趣的。
12. But thanks to the Great Green Wall, the land produces more crops.
但是幸亏有绿色长城，土地长出了更多的庄稼。
thanks to幸亏，由于。thanks为名词，常用复数。例如：
Thanks to your help, we were successful. Thanks to the policeman, the old man was brought home.
由于你的帮助，我们成功了。多亏了警察，老人被送回了家。
13. The Great Green Wall is 7, 000 kilometres long, and between 400 and 1, 700 kilometres wide.
绿色长城有7000公里长，400到1700公里宽。
（1）计量的表达法是：
主语+ be+数词+m
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